The continuing desire for multifunctional AIE materials has stimulated intensified research efforts to develop both innovative synthetic techniques and novel scaffolds. Herein, we report a new class of heterocyclic AIEgens, 1,2,3,6,7-pentaaryl substituted pyrano[3,2-b]pyrrol-5(1H)-ones, which contain an intriguing fused pyrrole/α-pyrone core. These structurally novel molecules were efficiently constructed via multicomponent reactions of easily accessible isatins, 2,3-diaryl cyclopropenones, and alkyl bromides in a single step under metal-free conditions. Subsequent late-stage modification of the resulting products was performed via the Suzuki–Miyaura coupling and reduction reactions. Furthermore, the HOMO/LUMO gaps were calculated and the single crystal structural analyses were conducted in order to gain deeper insights into the photophysical properties of these propeller-like AIEgens.

中文翻译：

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五芳基取代的吡喃[3,2-b]吡咯-5（1H）-酮的简便单步合成显示聚集诱导的发射


对多功能 AIE 材料的持续需求激发了加大研究力度，以开发创新的合成技术和新型支架。在此，我们报道了一类新的杂环 AIEgens，1,2,3,6,7-戊酰取代的吡喃[3,2-b]吡咯-5（1H）-酮，它包含一个有趣的熔融吡咯/α-吡喃酮核心。在无金属条件下，通过易接近的蚂蚁素、2,3-二芳基环丙烯酮和烷基溴的多组分反应，一步有效地构建了这些结构新颖的分子。随后通过 Suzuki-Miyaura 偶联和还原反应对所得产物进行后期修饰。此外，计算了 HOMO/LUMO 间隙并进行了单晶结构分析，以便更深入地了解这些类似螺旋桨的 AIEgens 的光物理特性。